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Three new species of the genus    Carychium    O.F. Müller, 1773,    Carychium   hardiei    Jochum &amp; Weigand,  sp. n. ,    Carychium   belizeense    Jochum &amp; Weigand,  sp. n.  and    Carychium   zarzaae    Jochum &amp; Weigand,  sp. n.  are described from the Southeastern United States, Belize and Panama, respectively. In two consecutive molecular phylogenetic studies of worldwide members of   Carychiidae  , the North and Central American morphospecies    Carychium   mexicanum    Pilsbry, 1891 and    Carychium   costaricanum    E. von Martens, 1898 were found to consist of several evolutionary lineages. Although the related lineages were found to be molecularly distinct from the two nominal species, the consequential morphological and taxonomic assessment of these lineages is still lacking. In the present paper, the shells of these uncovered    Carychium    lineages are assessed by comparing them with those of related species, using computer tomography for the first time for this genus. The interior diagnostic characters are emphasized, such as columellar configuration in conjunction with the columellar lamella and their relationship in context of the entire shell. These taxa are morphologically described and formally assigned their own names.

zookeys

Three new species of    Carychium    O.F. Müller, 1773 from the Southeastern USA, Belize and Panama are described using computer tomography (CT) (  Eupulmonata  ,   Ellobioidea  ,   Carychiidae  )